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what is key in sql

A key is a single or combination of multiple fields in a table.
It is used to fetch or retrieve records/data rows from the data table 
according to the condition/requirement. Keys are also used to create
a relationship among different database tables or views.

The following are the list of SQL Keys:

Primary Key
Unique Key
Candidate Key
Alternate Key
Composite Key
Super Key
Foreign Key

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